You'd probably get more useful replies if you mentioned whether the hum was in your transmitted signal or was audio hum in the shack.
Dave AB7E On 4/5/2020 1:50 PM, Carl Yaffey wrote:
I have developed a loud hum with the KPA1500 on 17m and 15m. A slight hum on 20m. All other bands, no hum. It’s power dependent. Loud at full power, hum reduces as power is lowered. Not too bad at 500w. Suggestions? 73. Carl, K8NU.
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